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Back in November, a leaked email from Apple to record label representatives indicated that 90 second song previews were in the works for the iTunes Music Store. Today, without much fanfare, the Cupertino company has begun to roll out the extended song previews to its digital music store. The site’s current top albums all have received the upgrade treatment, although, most songs still have the original 30 second previews. Apple has yet to issue a press release formally announcing the feature.

According to blog Symphonic Distribution, Apple will be extending the length of song previews in its U.S. iTunes Music store from 30 seconds to 90 seconds. The information comes courtesy of an email being sent around to “label representatives” that reads:

We are pleased to let you know that we are preparing to increase the length of music previews from 30 seconds to 90 seconds on the iTunes Store in the United States. We believe that giving potential customers more time to listen to your music will lead to more purchases.

The communication goes on to say that the letter legally modifies the U.S. Digital Music Download Sales Agreement that was previously in effect. The communication did not mention when the new music preview length would be implemented or if there are plans to expand the offering worldwide.